Automatically run a program on startup under Linux Ubuntu [closed]

by 
sudo mv /filename /etc/init.d/
sudo chmod +x /etc/init.d/filename 
sudo update-rc.d filename defaults

The script should now start on boot. Note that this method also works with both hard links and symbolic links (ln).

At this point in the boot process PATH isn’t set yet, so it is critical that absolute paths are used throughout. But, as pointed out in the comments by Steve HHH, explicitly declaring the full file path (/etc/init.d/filename) for the update-rc.d command is not valid in most versions of Linux. Per the manpage for update-rc.d, the second parameter is a script located in /etc/init.d/*.

Also as pointed out in the comments (by Charles Brandt), /filename must be an init style script. A good template was also provided – System V init script template.

As pointed out in the comments (by Russell Yan), this works only on default mode of update-rc.d.

According to the manual of update-rc.d, it can run on two modes: “the machines using the legacy mode will have a file /etc/init.d/.legacy-bootordering“, in which case you have to pass sequence and runlevel configuration through command line arguments.

The equivalent argument set for the above example is

sudo update-rc.d filename start 20 2 3 4 5 . stop 20 0 1 6 .

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